Abstract
Both full field and quasi-TEM time domain analyses of various coupled microstrip line configurations are presented and compared. The full field analysis as well as the quasi-TEM analysis are performed using (different) finite difference time domain algorithms. The first solves Maxwell's equations and the latter solves the multiconductor transmission line (MTL) equations. The capacitance and inductance matrices required for the MTL solution are determined using a previously published electrostatic Green's function technique. The coupled microstrip lines are terminated with resistive loads with values close to the characteristic impedances of the lines. Time domain results show that the quasi-TEM analysis is very qualitatively similar but not the same as the full field analysis. The quasi-TEM analysis requires much less computer resources and may be sufficient for some cases. For more complicated structures only a full field analysis can show some detailed coupling phenomena.
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